Contemporary Control Systems BASrouter Installation Guide (Firmware 2.x) - Manual (Page 10)

TD071200-0IK
10
Figure 10 — 3-wire MS/TP Bus with Separate Power Sources
3.2 Limited Power Sources
The router should be powered by a limited power source
complying with the requirements of the National Electric Code
(NEC) article 725 or other international codes meeting the same
intent of limiting the amount of power of the source. Under
NEC article 725, a Class 2 circuit is that portion of the wiring
system between the load side of a Class 2 power source and the
connected equipment. For AC or DC voltages up to 30 volts, the
power rating of a Class 2 power source is limited to 100 VA. The
transformer or power supply complying with the Class 2 rating
must carry a corresponding listing from a regulatory agency such
as Underwriters Laboratories (UL).
4 LEDs
Power glows green if power supplied to the unit is proper
Ethernet glows solid for a valid link (green for 100 Mbps or
yellow for 10 Mbps) and flashes to show activity
MS/TP flashes green when receiving valid MS/TP traffic